Automatic expansion-valve.



G. KNOX.

AUTOMATIC EXPANSION VALVE.

APPLICATION FILED HBA. 1910.

Vchain er above t e diaphragm and with the UNITED STATES PATENT OFFICE.

omen Knox, 'o1' OMAHA, Nnnnnsxn, Assienon or emanan' To JLL. nanna. or

oma, NEBRASKA.

sommario ExrANsIoN-vnvn.- k im' Patented-oct. 1o, lair..

To all whom it may concern: Be it known that I, Geenen KNOX, a citizenof the United States,y and a resident of 0maha,` in the county ofDouglas and State of Nebraska, have invented certain new and `usefulImprovements in Automatic Expansion-Valves, of which' the following 1s aspecification. Y e

' My invention relates to refrigerating mal chinery, and moreparticularly to automatic expansion valves or valves for automaticallycontrolling the admission of`a*compressed volatile liquid, such asammonia, into the portion of a refrigerating system in which suchiliquid is permitted to volatilize and expan ."V,

It is'the obj ect of my invention to provide a simplei and durablevalvev of this `type, which may beregulated while in 'use to 'varythe'expansion pressure necessary to cause. the closing of the 'valve andthe stopping of the supply Aof olatile liquid.

Constructions ernboilyingl my invention are illustrated iii thevaccompanying drawings, in which-- f `Figure 1 is a vertical sectionalview of` he valve, Fig.V 2 is a transverse" horizontal tion on theplanerof the lineV .fn--w'of `Fi 1, and Fig. il 1s a, detail elevationof the et-4 pipe hea'd and valve-stem supporting stirru In carrying outmy invention -I rovide a` suitable casing consisting principal y of twoapproximately bell-sha edbodies 1 and 2, having corresponding an es 3 atthe open ends thereof, through w lich Hanges" arel assed bolts 4 tosecure the bodies together. etween the `flanges 3 are clamped the edgesof a diaphra m 5 which separates the space, nclosed by t e casing intoan upper and a lower chamber.V The intermediate portion of the diaphragmis referbly corrugated,v ns shown, and throng the center thereof ispassed a threaded stem 6 having a flan e at the base thereof and whichis forme integrally with the stirrup 7 which extends downwardlytherefrom into the ychamber within the casing 2. The spring-cup 8isscrewed onto the stem 6 so that the diaphra is clam ed between them.In thel lowerv end thereof resting in said springycupn Sis a heavy coilspring 9, the upper. end of Specioation o! Letters Patent. i AApplication mea February 4, 1910. :um no. naomi.

' d which is screwd'ina threaded opehngfes' tendmg through the upper endAof the "f i".

at the lower end of a threaded stem 11;

1.v The upper endof t estem 11 is provi v. v,Ill

'with` a' rectan ular recess', indicatedV byftfff' i dotted lines 1n ig.1, ada tin 4the same f o'lta engagement with a. suitale ey by'whiclf,

the stem maybe turned from the outsidef the casing and the compressionofthe Spld E) varied and adjusted. At the up' `er en thep casing 1 is athreaded nipplleiV A12 velt which 1s screwed a cap 13 by which the'outeropening through which is` passed i. tubular* stem lfwhichrat its innerend tangular head 15 arrangedy to extend'. the transverse o enng in thestirr The? is -drawn intotpngagement withthefinneri l videdin' theabuttingparts t0 'HYGIN- tion ofthe stem. -Theouter en oftthe stem g lis.provided with a suitable coupling 11;)8 fbyj8 0,.

L -sx.- A,

which it is connected` with 'the' Vi j` tending to the liquid-receiverof? 4e refiigfx erating system.`A To permitA assembling gf, the stem andcasing, t e latter basan opening t; .erein opposite the opening :fortheistein.. and 'large enough to permit the headltqg be passed throu htheA same, the saidfopenq irlg bein'gnorma ly closed bythe plate.20 sown.

In the head 15 l'is formed a vvseafolir adapted to be engaged by theconical end of .a-Jvalve-stem 21 t9 close the openin from the stem '14int-o the chamber within t e casing. The head has a kerf made therein,as

shown, intersecting the lower part of the conical seat to form a freeAvent for the liquid froni the pipe 19 when the valve is open. The stem21 has a threaded poti'on which is screwed through the lower part of thestirrup 'I so that the stem is carried by and is movable with thestirrup.

elowV said theaded portion isa ortion 22 which extends loosely Into asimilarly formed recess or socket made in the head 23 o f a stem ofwhich the 105 `*portion adjoining thelhead is threadedand (the lowerportion of smaller diametr',`".un`

threaded, and at its lower end squared-tto adapt the same for engagementwith a suit-` able key or.socketwrench; The said stem 1'10 uared Emil 24extends tlifiu h albushing 25 screwed 4in stem .24 and resting against-ashoulder formed in the hore.,ol'""tlie bushing adjoining the threaded.portion thereof. 'lhe not 2T which 'is used to ress the gland 28 in uponthe paekinlr 29, is provided at. its outer end with a shield 3f)surrounding the lower squared end of the stem 249 rl`lie pipe 3l fromthe expansion coils of the relrigmfallng system is connected with thelower part o the casin f 2 by a suitable flange connection 32, as siown.

the (zap ifhva; indicated, to prevent leakage ol' the refrigerant from'the easing.

'hen the valve is in use the position of the stein 2l relative to thestirru i maybe' adjusted by turning Ythe stem 24, w lich stem forn'is,in c fl'eet, a prolongation of the valvestenr extending to the voutsideof the asing, the inner Av'and outer portions of `the stem having alongitudinally slidable connection whereby movement of the inner portionmay ocenr while the outer portion remains stationary. 'hen the pressurein the chamber fori-neil \`vithin the casing 2 below the dia- ]'ihrnginis in excess of the amount for wh'eh the ialve is set, the diaphragm israied against the spring Q so that the eonieal e id of the stem 21engages or al'iproaehes he valve `seat in the head 15 and .shuts oli' orreduces the .supply of liquid from-the pipe 19. Similarl y, when thepressure falls below the desired amount the valve is automaticallyopened by the downward movement of the diaphragm perniitted when thepressure in the lower ehamber is reduced. The

i Y Suitable gaskets '53 are provided for said flange con; neetion, thebushing 27;, plate 20, nut llfandf strength of the spring 9 is` madesuch that a ver sligl'ilt compression thereof, together wit theresilience ofthe dia hragm, will be sufficient to co'unterbaiance t lenor4 nal Jressure desired upon Ythe lower surface o the diaphragm, andadjustment of the compresion of the sprmg J seldom need be llllV e New,having described my invention, what I claim and desire to secure byLetters Patent is:

In an automatic expansion valve, a. casing, a diaphrogm arangedther-aiuto divide the space therein into an 'and a lower chamber,aspring arranged in the upper chamber to oppose pressure upon thediaphragm fromthe lower chamber, means for. adjusting the com ression ofthe sprin from the outside of tlie easing,fthe part o i 'the'casinginelosing the lower chamber havin o lesite o enin s therein, aniniet' ie haifinlgla shredded L(im passed throughpoge "t said openings and ahead lar er than said opening Ybut passable throug the other opening, anut disposed on theexternal part 4ofthe threaded stem for drawing thehead against the inner Wall of the casing, means lforclesing and openingop osite said head, a valve .seat for edin theI ead, a valve enrageahlewith aid valve seat to close the inletfrom the pipe avt'hreadedstemintegral .wi th said valve, a member depending from 4`the diaphragm andcarrying said threaded valve stem, and a 1stem Yslidahly andnonrotatahlyengaging said valve stem and extending through the casing tothe outside thereof. c l

In testimon whereof I havehereu'nto subscribed my name in the presenceof two 1vitn'esses.

l GEORGE KNOX. Witnesses: l

ROY G. Klwr D. O. BARNELL,

